**The cortical and subcortical nerve fiber bundles** are a complex of interneuronal ascending bundles of unmyelinated fibers that connect the spinal cord to the brainstem. In clinical neuroanatomy, this complex is called the Tolds bundle.
The nerve fibers that make up this bundle begin from the cells of the dorsal horns of the cervical segments of the spinal cord, then go to the medulla oblongata, the hypothalamus, the anterior nuclei of the thalamus opticus and end on the neurons of the visual area of the cerebral cortex. The fibers usually end in the tertiary layers of the gray matter of the parietal region and
**The corticotuberous bundle** is a set of structures that unite the cortex and thalamus of the brain. It is an important element in the central nervous system because it mediates communication between these two structures. Corkovatolamic bundle - (lat. fasciculus thalamocorticalis) or Krukenberg's bundle or Koller's bundle, coming from the anterior column of the thalamus